Component contributions to “sound stage”

Czarivey, even on Thursdays?

Have you noticed that sometimes when an OP asks a serious question, a difficult question, many of the responders poke fun because they can't provide a thoughtful,  experienced response.

In my experience regarding soundstage,  speakers are the most significant contributor, but that can be altered by source, amplification, room, etc.

Soundstage is recorded on the source.  So look for components that reproduce the source most accurately. 

Now I am only going by the numerous posts that have made this claim, but it would appear it's the power cable attached to your conditioner or amp.  🤣

As mentioned, the soundstage is in the recording. The components either reveal or obscure that to some degree, so they all matter.